Means for fastening boiler-tubes.



Patehted July 25, I899. 'r. HUBERDEAU.

MEANS FOR FASTENING BOILER TUBES.

(Application filed Apr. 4, 1899.]

'No Model.)

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UNITED STATES P TENT OFFICE.

THOMAS HUBERDEAU, OF LARIMORE, NORTH DAKOTA.

' MEANS FOR FASTENING BOILER-TUBESL SPECIFICATION forming part of Letters Patent No. 629,690, dated July 25, 1899.

Application filed April-4, 1899- Serial No. 711,675. (No model.)

-- T all uh om it and/y concern.-

Be it known that I, THOMAS HUBERDEAU, a citizen of the United States, residing at- Lari more, in the county of Grand Forks and State of North Dakota, have invented certain new and useful Improvements in Means for Fas: tening Boiler Tubes or Flues; and I do here by declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap-j pertains to make 'and'use the same."

This invention relates to means for fasten-j ing boiler. tubes and flues; and the purpose of the same is to make provision for the inequality of expansion and contraction of the parts comprising the joints due to sudden changes and drafts, whereby leaking at the joints is obviated.

The invention consists ofthe construction and arrangement of parts more fully hereinafter described andclaimed. I l y In the accompanying drawings,-Figure 1 is a perspective view of portions of opposite boiler-heads or flue-sheets, as the case may be, showing the improved mode of fastening the tubes or the flues. Fig; 2 is a vertical longitudinal section of one of the tubes or flues, on

an enlarged scale and better illustrating therelative position of the fastening means. Fig.

3 is a detail perspective View of one of the tubes or flues. Fig. 4 is a detail perspective Vl6W ofone of the fastening devices.

Referring to the drawings, wherein similar numerals are utilized to indicate corresponding parts in the several views, the numeral 1 designates opposite heads'or sheets and having openings 2 therein at regular intervals to receive the tubes or flues 3. The latter may be formed in any manner now well known, with the exception of such features as are usually provided to facilitate beading, crimping, and flanging. The exterior of the opposite end portions of the flues or tubes are provided with screw-threads 4 but otherwise the primal structure of the same remains normal and undisturbed.

The openings 2 are larger than the diameter of the tubes or flues, and to hold the latter in the heads or sheets 1 tubular fastenings 5 are employed, each havin g a screw-threaded bore 6 and an outer flange 7, with a polygonal perimeter for engagement by awrench or other similar implement. Immediately next to the flange 7 a circumferential shoulder or enlarge.- ment 8 is-formed on the fastening device and is threaded, as at t), and adapted to engage drawn through the latter in the operations of assembling or disconnecting the parts.

Inconnecting up the several parts the tubes or flues are inserted through the opposite heads or sheets and the ends receive the tubular fastenings 5. ,WVhen these latter are firmly screwed in'place, the threaded portions Qthereof snugly fit in the threaded openings 2, and thefianges 7 at opposite ends bear against the outer sides of the said heads or sheets. By this meansthe tubes-or flues are similarly set at opposite ends and being of the same thickness from end to end, and the fastenings in the main also being of the same thickness the expansion and contraction will be equal, or nearly so. When the flues expand from the heat, they will remain firm in their securement, and when the cold air strikes both the flues and fastenings the shrinkage, which occurslongitudinally, will cause the shoulders and flanges of the fastenings to be drawn tightly against the heads or sheets,but, owing to a similarity of material and thickness of the portions of vthe device most affected, not so tight as to occasion any breaking of the said tubes or fl'ues. Consequently a durable construction is provided and also means for quickly assembling the parts of the boiler set forth and the use of expanding tools or implements is dispensed with entirely. 7

As shown, the extremities of the tubes or flues extend to near the outer face of the tube-sheet, but terminate within the fastenings a short distance from the outer ends of the latter in order to prevent the cold air from striking the ends of the-tubes first and chilling them to the extent of starting the joint between the parts 3 and 5 when the furnacedoor is opened. By having the flues extend to near the outer face of the flue-sheet the weight of the flues and the strains exerted by expansion and contraction are sustained by both the sheet andfastening and not thrown entirely upon the latter, and by having the flues terminate shortof the outer ends of the fastenings the cold air strikes the flanged ends of the fastenings, which, being compar-' atively heavy, are not so readily susceptible to sudden changes of temperature and draft. The fastenings project beyond the inner faces of the flue-sheets a distance to insure a firm and stable support and connection of the flues therewith, and in order that the fastenings may not become stuck bycorrosion of the externally-threaded portions 8 the inner ends thereof are reduced and made planesurfaced, so that they maybe readilywithdrawn through the openings 2, While said threaded portions 8 are madeeqnal in extent to the thickness of the flue-sheets, so as not to project beyond the inner face thereof and so as to be protected as much aspossible to prevent the deposit and incrustation of foreign matter thereon.

The proportions and dimensions of the several parts will be changed to accommodate various applications Without departing from the nature or spirit of the invention.

Having thus described the invention, What is claimed as new is-- a 1. A'tubular fastening for boiler fines or tubes having an internally-threaded bore, an outer external flange, a central externally threaded portion, and an inner plane portion of less diametrical extent than said externally-threaded portion, said parts being arranged and operating as in the manner and for the purpose shown and described.

2. In a fastening for the ends of tubes and flues, the combination of a fiue-sheet having a threaded opening, a fastening inserted in said opening and provided with an internally-threaded bore, an outerexternal flange abutting against the outerface of the sheet, a central externally-threaded portion engaging the threads of the opening in the flue-sheet and of a width or extent corresponding to the thickness of said sheet so as to be protected thereby from the deposit and incrustation of foreign matter thereon, and an innenplane portion of less diametrical extent than the said externally-threaded portionand projectbore of thefastening to near the outer face of the flue-sheet and terminating short of the outer end of the fastening, substantially as and for the purpose shown and described.

In testimony whereof I affix my signature in presence of two Witnesses.

THOMAS HUBERDEAU.

lVitnesses:

A. STQNEHOUSE, G. W. SWINGEL.

ing therefrom beyond the inner face of the v flue-sheet, and a flue havinga threaded end serewedtinto the inner end-of the threaded 

